Legal Bang Patterns cannot parse
According to the syntax provided by GHC user guide
pat ::= !pat
Both !!pat and pat : !pat should be accepted, but GHC gives parsing error. For detail see http://stackoverflow.com/questions/31790327/where-can-bangpatterns-appear
There also lacks a formal documentation regarding where BangPatterns can appear (the User Guide mentions in passing that "a pattern with a bang at the outermost level is not allowed at the top level of a module." Are there other restrictions?)
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Relates to
- #10879.0.15
Activity
added Tbug Trac import parser labels
mentioned in issue #11189 (closed)
Also reported as #11189 (closed). More investigation in #1087 (closed) (reported 9 years ago!) and http://hackage.haskell.org/trac/haskell-prime/wiki/ArrayIndexing.
Trac metadata
Trac field Value Related - → #1087 (closed), #11189 (closed) added Pnormal label
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